sysdeps/mach/hurd/i386/sys/io.h

   1 /* Access to hardware i/o ports.  GNU/x86 version.
   2    Copyright (C) 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _SYS_IO_H
  21 #define _SYS_IO_H       1
  22
  23 #include <features.h>
  24
  25 __BEGIN_DECLS
  26
  27 /* If TURN_ON is TRUE, request for permission to do direct i/o on the
  28    port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
  29    permission off for that range.  This call requires root privileges.  */
  30 extern int ioperm (unsigned long int __from, unsigned long int __num,
  31                    int __turn_on) __THROW;
  32
  33 /* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
  34    access any I/O port is granted.  This call requires root
  35    privileges. */
  36 extern int iopl (int __level) __THROW;
  37
  38 #if defined __GNUC__ && __GNUC__ >= 2
  39
  40 static __inline unsigned char
  41 inb (unsigned short int port)
  42 {
  43   unsigned char _v;
  44
  45   __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (port));
  46   return _v;
  47 }
  48
  49 static __inline unsigned char
  50 inb_p (unsigned short int port)
  51 {
  52   unsigned char _v;
  53
  54   __asm__ __volatile__ ("inb %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
  55   return _v;
  56 }
  57
  58 static __inline unsigned short int
  59 inw (unsigned short int port)
  60 {
  61   unsigned short _v;
  62
  63   __asm__ __volatile__ ("inw %w1,%0":"=a" (_v):"Nd" (port));
  64   return _v;
  65 }
  66
  67 static __inline unsigned short int
  68 inw_p (unsigned short int port)
  69 {
  70   unsigned short int _v;
  71
  72   __asm__ __volatile__ ("inw %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
  73   return _v;
  74 }
  75
  76 static __inline unsigned int
  77 inl (unsigned short int port)
  78 {
  79   unsigned int _v;
  80
  81   __asm__ __volatile__ ("inl %w1,%0":"=a" (_v):"Nd" (port));
  82   return _v;
  83 }
  84
  85 static __inline unsigned int
  86 inl_p (unsigned short int port)
  87 {
  88   unsigned int _v;
  89   __asm__ __volatile__ ("inl %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
  90   return _v;
  91 }
  92
  93 static __inline void
  94 outb (unsigned char value, unsigned short int port)
  95 {
  96   __asm__ __volatile__ ("outb %b0,%w1": :"a" (value), "Nd" (port));
  97 }
  98
  99 static __inline void
 100 outb_p (unsigned char value, unsigned short int port)
 101 {
 102   __asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80": :"a" (value),
 103                         "Nd" (port));
 104 }
 105
 106 static __inline void
 107 outw (unsigned short int value, unsigned short int port)
 108 {
 109   __asm__ __volatile__ ("outw %w0,%w1": :"a" (value), "Nd" (port));
 110
 111 }
 112
 113 static __inline void
 114 outw_p (unsigned short int value, unsigned short int port)
 115 {
 116   __asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80": :"a" (value),
 117                         "Nd" (port));
 118 }
 119
 120 static __inline void
 121 outl (unsigned int value, unsigned short int port)
 122 {
 123   __asm__ __volatile__ ("outl %0,%w1": :"a" (value), "Nd" (port));
 124 }
 125
 126 static __inline void
 127 outl_p (unsigned int value, unsigned short int port)
 128 {
 129   __asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80": :"a" (value),
 130                         "Nd" (port));
 131 }
 132
 133 static __inline void
 134 insb (unsigned short int port, void *addr, unsigned long int count)
 135 {
 136   __asm__ __volatile__ ("cld ; rep ; insb":"=D" (addr),
 137                         "=c" (count):"d" (port), "0" (addr), "1" (count));
 138 }
 139
 140 static __inline void
 141 insw (unsigned short int port, void *addr, unsigned long int count)
 142 {
 143   __asm__ __volatile__ ("cld ; rep ; insw":"=D" (addr),
 144                         "=c" (count):"d" (port), "0" (addr), "1" (count));
 145 }
 146
 147 static __inline void
 148 insl (unsigned short int port, void *addr, unsigned long int count)
 149 {
 150   __asm__ __volatile__ ("cld ; rep ; insl":"=D" (addr),
 151                         "=c" (count):"d" (port), "0" (addr), "1" (count));
 152 }
 153
 154 static __inline void
 155 outsb (unsigned short int port, const void *addr, unsigned long int count)
 156 {
 157   __asm__ __volatile__ ("cld ; rep ; outsb":"=S" (addr),
 158                         "=c" (count):"d" (port), "0" (addr), "1" (count));
 159 }
 160
 161 static __inline void
 162 outsw (unsigned short int port, const void *addr, unsigned long int count)
 163 {
 164   __asm__ __volatile__ ("cld ; rep ; outsw":"=S" (addr),
 165                         "=c" (count):"d" (port), "0" (addr), "1" (count));
 166 }
 167
 168 static __inline void
 169 outsl (unsigned short int port, const void *addr, unsigned long int count)
 170 {
 171   __asm__ __volatile__ ("cld ; rep ; outsl":"=S" (addr),
 172                         "=c" (count):"d" (port), "0" (addr), "1" (count));
 173 }
 174
 175 #endif  /* GNU C */
 176
 177 __END_DECLS
 178 #endif /* _SYS_IO_H */